Developing them require time and access to previous technology.
Some require additional fee for developing them, worth from few to more than dozen thousands coins.
All technologies that require fee can be found in the central part of every tree.
In case of some factions there are technologies that cancels the effects of ones previously developed.
It works like a trade - you lose access to some buildings or bonuses, but gain other ones.
After developing all technologies from a group you get additional bonus.
To find out more, move the cursor on the icon in the right lower corner of a group.
Bonuses are small, usually few percents, but high enough to feel the difference.
Military technologies have an economical aspect as well.
In addition to unlocking new buildings, they reduce the recruitment and maintaining cost of units.
Developing further technologies increase profits from a specific building category or lower the cost of building them.
The ones from higher levels increasegrowth, tax income or lower thecorruptionas well.
Unlocking a whole set will increasepublic order, sanitationor food production.
Other will be more important for countries that need money.
In case ofpublic orderandsanitationbonuses you must think few steps ahead.
Just as in case of military research.
You won’t get quickly to technologies of level III and higher.
Especially if you want to develop military technologies simultaneously.
In that case, it is better to focus on developing technology sets.
With 100% speed of researching technologies the last position from the tree will require 150 turns.
Combined with others required for developing it, it is almost 400.

In long term, cheap technologies and set will give you more profits than the better ones.
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